X-ray or gamma ray systems or devices – Specific application – Absorption
Patent
1996-07-26
1997-12-02
Porta, David P.
X-ray or gamma ray systems or devices
Specific application
Absorption
378 9811, 25036302, G01N 2304
Patent
active
056944470
ABSTRACT:
Frequency signals of a plurality of different frequency bands are obtained by transforming each of image signals into a multi-resolution space. Each image signal represents one of radiation images of a single object, which have been formed respectively with a plurality of kinds of radiation having different energy distributions and in which different images of at least part of the object are embedded. Signal components of the frequency signals, which are of an identical frequency band and correspond to different image signals, are weighted with weight factors, which are set in accordance with the frequency band, the signal components representing corresponding picture elements in frequency images represented by the frequency signals. The weighted signal components of the frequency signals are subtracted from one another. Difference signals are thus obtained for the plurality of the different frequency bands. An inverse transform is carried out on the difference signals, and an energy subtraction signal is thereby obtained.
REFERENCES:
patent: 5049748 (1991-09-01), Ito et al.
patent: 5210415 (1993-05-01), Ito
patent: 5461655 (1995-10-01), Vuylsteke et al.
Bruce David Vernon
Fuji Photo Film Co. , Ltd.
Porta David P.
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